Got this after the airline lost my bag with my Arc'teryx FL-365 harness, and this seemed like a good alternative since Arc'teryx doesn't make anything like that one anymore.
Though I haven't tried it, the Blue Ice Halo looks like it would be the truer replacement, but this one is a great deal and I can still fit a full rack (0.5-3 BD + several small cams) on either of the front gear loops. That being said, they are a little small, and the rear gear loops in particular are small and can be hard to reach. I have a 30-inch waist and have worn both the medium and small sizes now. The medium is a hair too big, but because I have to cinch it down, the gear loops are farther forward and easier to use. The rear gear loops on the medium are about half an inch wider than on the small, which is frustrating. With the small being less tight, the front gear loops are quite far back, and the rear loops are completely behind me and difficult to use at all. So if you're on the edge of the sizing, consider that it will affect your gear loop placement / access / comfort / sizing. I'm still a big fan of this harness and would definitely recommend as an Arc'teryx alternative. It is incredibly light, comfortable, and packable, and you learn to live with the gear loops (or add your own). Would love a 5th loop though. For sport and trad (I don't ice climb so can't speak to it), I'd say this thing should be Outdoor Gear Lab's best buy.